Alert archive / Iowa / Flash Flood Warnings in 2011
Flash Flood Warning 21, NWS La Crosse, WI
NWS La Crosse, WI issued this flash flood warning at Sep 3, 2011, 1:46 AM CDT for Fayette County, Iowa. It was in force for 4 hr. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Sep 3, 2011, 1:46 AM CDT (06:46 UTC)
- Expired
- Sep 3, 2011, 5:47 AM CDT
- In force
- 4 hr
- Issued by
- NWS La Crosse, WI
- Area
- Storm-based polygon
- Flood severity
- None
County Fayette County, IA
The radar
The La Crosse radar (KARX), 136 km from the middle of the area, began a volume at 06:46 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Davenport, (KDVN), launched 00:00Z, 6.8 hours before the alert went out and 170 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 1861 J/kg
- Mixed-layer CIN
- -107 J/kg
- Mixed-layer LCL
- 1596 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 87 m²/s²
- 0-3 km storm-relative helicity
- 165 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 3.6
The text
As transmitted, in the capitals the NWS used until 2016.
386
WGUS53 KARX 030646
FFWARX
IAC065-031230-
/O.NEW.KARX.FF.W.0021.110903T0646Z-110903T1230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LA CROSSE WI
146 AM CDT SAT SEP 3 2011
THE NATIONAL WEATHER SERVICE IN LA CROSSE HAS ISSUED A
* FLASH FLOOD WARNING FOR...
SOUTHERN FAYETTE COUNTY IN NORTHEAST IOWA...
* UNTIL 730 AM CDT
* AT 144 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
SLOW MOVING THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE
WARNED AREA. DOPPLER RADAR ESTIMATED THAT UP TO 3 INCHES OF RAIN
HAS FALLEN OVER THE PAST 2 HOURS. ADDITIONAL RAINFALL OF 1 TO 2
INCHES WILL BE POSSIBLE OVER THE NEXT FEW HOURS.
* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
OELWEIN...ARLINGTON...FAYETTE AND MAYNARD. SOME RIVERS AND STREAMS
THAT WILL EXPERIENCE FLOODING INCLUDE THE LITTLE WAPSIPINICON
RIVER...OTTER CREEK AND THE LITTLE VOLGA RIVER.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...COUNTRY ROADS...AS WELL AS FARMLAND ALONG THE
BANKS OF CREEKS AND STREAMS.
BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. DO
NOT ENTER THE WATER. TURN AROUND AND MOVE UP TO HIGHER GROUND TO
ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS SUBJECT TO FLOODING WHEN
WATER BEGINS RISING.
FLOODING IS OCCURRING OR IS IMMINENT. IT IS IMPORTANT TO KNOW WHERE
YOU ARE RELATIVE TO STREAMS...RIVERS...OR CREEKS WHICH CAN BECOME
KILLERS IN HEAVY RAINS. CAMPERS AND HIKERS SHOULD AVOID STREAMS OR
CREEKS.
&&
LAT...LON 4264 9209 4288 9209 4288 9161 4264 9161
4264 9208
$$
HALBACH3 follow-up statements
591
WGUS73 KARX 030747
FFSARX
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
247 AM CDT SAT SEP 3 2011
IAC065-031230-
/O.CON.KARX.FF.W.0021.000000T0000Z-110903T1230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
FAYETTE IA-
247 AM CDT SAT SEP 3 2011
...FLASH FLOOD WARNING REMAINS IN EFFECT FOR SOUTHERN FAYETTE COUNTY
UNTIL 730 AM CDT...
AT 245 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE WARNED AREA.
DOPPLER RADAR ESTIMATES THAT 3 TO 4 INCHES OF RAIN HAS FALLEN OVER
THE PAST FEW HOURS WITH AN ADDITIONAL HALF INCH OF RAIN POSSIBLE
THROUGH 4 AM.
RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING
INCLUDE...OELWEIN...ARLINGTON...FAYETTE AND MAYNARD. SOME RIVERS AND
STREAMS THAT WILL EXPERIENCE FLOODING INCLUDE THE LITTLE VOLGA
RIVER...LITTLE WAPSIPINICON RIVER...AND OTTER CREEK.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLOODING OF SMALL CREEKS
AND STREAMS...COUNTRY ROADS...NORMALLY DRY WASHES... AS WELL AS
FARMLAND ALONG THE BANKS OF CREEKS AND STREAMS.
BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLOODING IS OBSERVED...ACT QUICKLY. DO NOT
ENTER THE WATER. TURN AROUND AND MOVE UP TO HIGHER GROUND. DO NOT
STAY IN AREAS SUBJECT TO FLOODING WHEN WATER BEGINS RISING.
FLOODING IS OCCURRING OR IS IMMINENT. IT IS IMPORTANT TO KNOW WHERE
YOU ARE RELATIVE TO STREAMS...RIVERS...OR CREEKS WHICH CAN BECOME
KILLERS IN HEAVY RAINS. CAMPERS AND HIKERS SHOULD AVOID STREAMS OR
CREEKS.
&&
LAT...LON 4264 9209 4288 9209 4288 9161 4264 9161
4264 9208
$$
HALBACH006
WGUS73 KARX 030845
FFSARX
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
345 AM CDT SAT SEP 3 2011
IAC065-031230-
/O.CON.KARX.FF.W.0021.000000T0000Z-110903T1230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
FAYETTE IA-
345 AM CDT SAT SEP 3 2011
...FLASH FLOOD WARNING REMAINS IN EFFECT FOR SOUTHERN FAYETTE COUNTY
UNTIL 730 AM CDT...
AT 341 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE WARNED AREA.
DOPPLER RADAR ESTIMATES SHOW THAT 3 TO 4 INCHES OF RAIN HAS FALLEN
ACROSS PORTIONS OF SOUTHERN FAYETTE COUNTY.
RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING
INCLUDE...WESTGATE...OELWEIN...ARLINGTON...FAYETTE AND MAYNARD. SOME
RIVERS AND STREAMS THAT WILL EXPERIENCE FLOODING INCLUDE THE LITTLE
WAPSIPINICON RIVER...THE LITTLE VOLGA RIVER...OTTER CREEK...AND STOE
CREEK.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLOODING IS OBSERVED...ACT QUICKLY. DO NOT
ENTER THE WATER. TURN AROUND AND MOVE UP TO HIGHER GROUND. DO NOT
STAY IN AREAS SUBJECT TO FLOODING WHEN WATER BEGINS RISING.
FLOODING IS OCCURRING OR IS IMMINENT. IT IS IMPORTANT TO KNOW WHERE
YOU ARE RELATIVE TO STREAMS...RIVERS...OR CREEKS WHICH CAN BECOME
KILLERS IN HEAVY RAINS. CAMPERS AND HIKERS SHOULD AVOID STREAMS OR
CREEKS.
&&
LAT...LON 4264 9209 4288 9209 4288 9161 4264 9161
4264 9208
$$
HALBACH790
WGUS73 KARX 031047
FFSARX
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
547 AM CDT SAT SEP 3 2011
IAC065-031058-
/O.CAN.KARX.FF.W.0021.000000T0000Z-110903T1230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
FAYETTE IA-
547 AM CDT SAT SEP 3 2011
...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR SOUTHERN FAYETTE
COUNTY IS CANCELLED...
HEAVY RAINFALL HAS EXITED EAST OF THE AREA. CALLS TO LAW ENFORCEMENT
INDICATED THERE WAS NO FLOODING OBSERVED. SCATTERED SHOWERS AND
THUNDERSTORMS WILL BE SEEN ACROSS THE AREA TODAY. HOWEVER...
WIDESPREAD HEAVY RAINFALL IS NOT EXPECTED. IF FLOODING HAS BEEN
OBSERVED IN YOUR AREA...PLEASE REPORT IT TO YOUR LOCAL LAW
ENFORCEMENT AGENCY.
LAT...LON 4264 9209 4288 9209 4288 9161 4264 9161
4264 9208
$$
DASThe office that day
Everything else NWS La Crosse, WI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 2, 11:58 PM CDT | Severe Thunderstorm Warning | ARX | Clayton, Fayette | 62 min |
| Sep 3, 12:54 AM CDT | Severe Thunderstorm Warning | ARX | Allamakee, Clayton | 66 min |
| Sep 3, 2:13 AM CDT | Severe Thunderstorm Warning | ARX | Clayton, Fayette | 47 min |
| Sep 3, 2:53 AM CDT | Flash Flood Warning | ARX | Clayton | 3 hr |
Nearby
Flash Flood Warnings in Iowa, 2011Every flash flood warning in 2011
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.